Traditional, state-of-the-art and renewable thermal building insulation materials: An overview

Formation and evolution of distorted tulip flames

A G Gaydon and H G Wolfhard London: Chapman and Hall 1970 pp + 365 price £6 With the rapid expansion of combustion science in and over so many fields in the last decade, it is a relief to learn of a new edition of this well known book. Although the framework of this volume will be reassuringly recognizable to first edition veterans, the contents, which include the extra chapter topics of the second edition, have been thoroughly sifted to bring the frontier information up to date.

https://iopscience.iop.org/article/10.1088/0031-9112/22/3/032/pdf

Flames: Their Structure, Radiation and Temperature

Hydrogen as an energy carrier is a very promising alternative fuel in the future. Accidental hydrogen explosions remain one of the major concerns in hydrogen energy utilization and process industries. This paper summarizes recent experimental and numerical efforts towards understanding combustion wave propagation in hydrogen explosions, including flame instabilities, flame acceleration, deflagrations, and deflagration-to-detonation transition (DDT). The fundamental problems involve understanding physical mechanisms that significantly influence the dynamic flame behavior in hydrogen explosions, such as combustion/hydrodynamic instabilities, vortex motion, pressure waves and flow turbulence. Advances achieved over recent years in new experimental observations, theoretical models and numerical simulations are discussed. Future research is required to quantitatively understand flame instabilities, turbulence properties and DDT in hydrogen explosions and improve reliability of theoretical and numerical predictions for hydrogen safety applications.

Premixed flame propagation in hydrogen explosions

Eco-friendly geopolymer materials: A review of performance improvement, potential application and sustainability assessment

In this work, thermal analysis methods were used to obtain the temperature field of discrete flame spread across polystyrene (PS) foam inserted with incombustible barrier. The barrier length (L
 0) and the length (L) of PS below were changed to investigate their effects. The frontal temperature field (X–Z plane) showed that in cases where barrier prevented upward flame spread, the flame spread consists of three stages, namely growth stage, heating stage, and attenuation stage (or “upward spreading stage” for failed preventing case). During the heating stage, the area and the height of high-temperature zone (about 630–750 °C) in failed preventing cases were significantly larger than those in prevented cases, while the heating stage duration of the former was shorter. The maximum temperature was observed below the barrier. For XPS with lower length ratio (L/L
 0), the area of the high-temperature zone is larger than that of EPS with higher length ratio. The temperature field of the longitudinal section (Y–Z plane) revealed that the high-temperature zone was localized between −1 and 1 cm of the Y-axis. With the varying of L/L
 0 (L/L
 0 decreased for XPS while for EPS L/L
 0 first dropped and then rose), the vertical distance between the high-temperature zone and the unburned PS surface increased, while the area of the high-temperature zone and the temperature gradient decreased. Thus, the upward flame spread was prevented. These findings are helpful to reveal the mechanism of discrete flame spread.

Experimental study on temperature field of upward flame spread over discrete polystyrene foam

Prediction of heat release rate of single/double 32,650 lithium ion batteries

Flame spread over cables in a utility tunnel: Effect of longitudinal wind and inclination angle

The numerical simulation method is used to simulate the distribution characteristics of the smoke temperature field of a double-deck bridge smoke temperature field during tanker fire under natural ventilation. The influence of the distance between double decks on the truss and ceiling temperature field change in the double-deck bridge is investigated. The results show that the range of high-temperature area gradually decreases with the increase in bridge deck spacing. The maximum excess temperature function of the tunnel ceiling is also applicable to the bridge, but the coefficient is smaller than that of the tunnel experimental formula. An equation is proposed to predict the maximum excess temperature of the truss under different bridge deck spacings. As the bridge deck spacing increases, the maximum excess temperature decreases. The excess temperature of the truss increases along the truss, and the maximum excess temperature appears at the top of the truss. Based on the energy equation, an equation for the excess temperature of the truss is established. As the vertical height increases, the excess temperature of the truss above the fire source exponentially increases. The research results will contribute to the fire hazard evaluation and safety design of bridges.

/pdf/study-on-the-effect-of-bridge-deck-spacing-on-3cs0i0q7.pdf

Weiguang An

Papers

Experimental study on temperature field of upward flame spread over discrete polystyrene foam

Prediction of heat release rate of single/double 32,650 lithium ion batteries

Flame spread over cables in a utility tunnel: Effect of longitudinal wind and inclination angle

Study on the Effect of Bridge Deck Spacing on Characteristics of Smoke Temperature Field in a Bridge Fire

Influence of longitudinal wind on thermal runaway and fire behaviors of 18650 lithium-ion batteries in a restricted channel